Product Manual

Using Vscan
3-8 Vscan – User Manual
GM092207 02
Color aliasing
If the blood flow velocity exceeds the maximum velocity range
the system can cover, based on the sampling rate used, aliasing
will occur.
Aliasing will appear as a shift in color from the color representing
positive velocity to color representing negative velocity or visa
versa.
The maximum velocity is displayed on top of the color bar.
Auto freeze
If Vscan is idle for more than the Auto freeze time set in Config it
enters in freeze mode to minimize overheating. Press Select to
start scanning again.
AutoCycle
Vscan does not include an ECG interface as often found on
larger ultrasound systems intended for cardiovascular
applications. The AutoCycle feature detects a complete cardiac
cycle by analyzing the cyclicity of the ultrasound intensity data.
The resulting time-stamps are used for storing and playing
cineloops smoothly. The AutoCycle feature should typically
detect heart rates in the range 46–100 beats per minute. If the
detected heart cycle is outside this range, or if the cyclicity
quality is too poor, a default 2 sec loop will be used instead. The
detected start and stop times for the AutoCycle are not
necessarily in phase with the QRS complex. Since adequate
cyclicity can only be expected in cardiac applications, all other
applications will use the default 2 sec loop.